Electronic device, device identification method, and charging system

A device identification method, comprising:

• controlling, by a controller of an electronic device that comprises a processor, the controller, a charging protocol chip, an external interface, and a switch circuit, the switch circuit, wherein the processor, the charging protocol chip, and the external interface each comprise a data pin unit, and wherein the data pin unit of the processor, the data pin unit of the charging protocol chip, the data pin unit of the external interface, and the controller are separately electrically connected to the switch circuit, wherein the controller controls the switch circuit so that the data pin unit of the external interface is connected to the data pin unit of the charging protocol chip and is disconnected from the data pin unit of the processor;
• identifying, by the charging protocol chip, a type of an external device connected to the external interface;
• after the charging protocol chip fails in the identification, controlling, by the controller, the switch circuit, so that the data pin unit of the external interface is disconnected from the data pin unit of the charging protocol chip and is connected to the data pin unit of the processor;
• and
• identifying, by the processor the type of the external device connected to the external interface.

An electronic device, comprising a processor, a controller, a charging protocol chip, an external interface, and a switch circuit, wherein

• the processor, the charging protocol chip, and the external interface each comprise a data pin unit;
• the data pin unit of the processor, the data pin unit of the charging protocol chip, the data pin unit of the external interface, and the controller are separately electrically connected to the switch circuit;
• and
• the controller is configured to control the switch circuit, so that the data pin unit of the external interface is connected to the data pin unit of the charging protocol chip and is disconnected from the data pin unit of the processor;
• the charging protocol chip is configured to perform second protocol identification on an external device when the external interface is connected to the external device;
• the controller is configured to control the switch circuit after receiving an indication that is sent by the charging protocol chip and that indicates that the second protocol identification fails, so that the data pin unit of the external interface is disconnected from the data pin unit of the charging protocol chip and is connected to the data pin unit of the processor;
• the processor is configured to perform first protocol identification on the external device when the external interface is connected to the external device and the data pin unit of the processor is connected to the pin unit of the external interface;
• and
• the first protocol comprises a data transmission protocol, and the second protocol comprises a fast charging protocol.